How to Cache GetComponent in C#

I'm trying to avoid putting a GetComponent in my update function, so I don't have to hog up the memory. I keep getting the error "A field initializer cannot reference the nonstatic field, method, or property" please help me find a way on how to do this, thank you.

Code (CSharp):

1. using UnityEngine;
2. using System.Collections;
3.  
4. public class CameraTransition : MonoBehaviour
5. {
6.  
7.     public Transform Lerposa;
8.     public Transform Lerposb;
9.     public Transform cameraanim;
10.     public Transform fadeObj;
11.    
12.  
13.     void Start ()
14.     {
15.  
16.         public float fadeAlpha = fadeObj.GetComponent<Renderer>().material.a;
17.     }

 

create a handle: private Render _render;

Assign the handle to the component in void Start()

_render = fadeObj.GetComponent<Renderer>();

_render.material.color = new Color()

 

It's now giving me an error saying "The type or namespace "Render" could not be found"

Code (CSharp):

1.     public Transform Lerposa;
2.     public Transform Lerposb;
3.     public Transform cameraanim;
4.     public Transform fadeObj;
5.     private Render _render;
6.  
7.  
8.     void Start ()
9.     {
10.         _render = fadeObj.GetComponent<Renderer>();
11.     }

 

What is a Renderer component? You probably want a MeshRenderer component or something.

To cache the component in a local variable, you'll do this:

Code (csharp):

1. using UnityEngine;
2. using System.Collections;
3.  
4. public class CameraTransition : MonoBehaviour
5. {
6.     public Transform Lerposa;
7.     public Transform Lerposb;
8.     public Transform cameraanim;
9.     public Transform fadeObj;
10.  
11.     private Renderer _cachedComponent;
12.     private float _fadeAlpha;
13.  
14.     void Start()
15.     {
16.         _cachedComponent = fadeObj.GetComponent<Renderer>(); // Get and store the component one time.
17.     }
18.  
19.     void Update()
20.     {
21.         _fadeAlpha = _cachedComponent.material.color.a; // Reuse it here in update, but without having to GetComponent again.
22.     }
23. }

You have some syntax errors. Do you have a basic grasp on C# and Unity? Make sure you understand what you are trying to code up instead of working aimlessly.

 

Sorry. Typo.

Private Renderer _render

 

same thing bruh.

 

Read my post instead of blindly copy-pasting.

 

Odd... Now it's saying "Cannot modify the return value of 'Material.color' because it is not a variable"

Code (CSharp):

1. using UnityEngine;
2. using System.Collections;
3.  
4. public class CameraTransition : MonoBehaviour
5. {
6.  
7.     public Transform Lerposa;
8.     public Transform Lerposb;
9.     public Transform cameraanim;
10.     public Transform fadeObj;
11.     private Renderer _render;
12.  
13.  
14.     void Start ()
15.     {
16.         _render = fadeObj.GetComponent<Renderer>();
17.     }
18.  
19.  
20.  
21.     void Update ()
22.     {
23.  
24.           if (!cameraanim.gameObject.GetComponent<Animation>().IsPlaying("wobble"))
25.           {
26.             _render.material.color.a += 0.1f;
27.           }

 

If i use..

Code (CSharp):

1.         if (fadeObj.GetComponent<Renderer>().material.color.a == 1)
2.           {
3.               transform.position = Vector3.Lerp(Lerposa.position, Lerposb.position, 0.1f);
4.               Lerposb.gameObject.SetActive(true);
5.           }

it works.

 

"_render.material.color.a+= 0.1f;"

C# doesn't let you modify a value like that. It requires a temp variable or this:

_render.material.color = new Color(R, G, B, A(0.1f));


I have a youtube video on GetComponent. I suggest checking it out.

 

Ohhh ok sorry, was going off of a tutorial meant for UnityScript.
How would I do something like this..

Code (CSharp):

1. _render.material.color.a += 0.1f * Time.deltaTime;

In C#?

 

Actually, I'll just look it up. Thanks for all of your help!

 

Code (CSharp):

1. var renderer = GetComponent<Renderer>();
2.         var material = renderer.material;
3.         var color = material.GetColor(materialColorName);
4.         color.a += 0.1f * Time.deltaTime;
5.         material.SetColor(materialColorName, color);
6.         renderer.sharedMaterial = material;

 

Yuck....

Color newColor = _render.material.color;
newColor.a = 0.1f * Time.deltaTime;
_render.material.color = newColor;

 

You reference .material which creates a new material instance and then assign that instance back to shared material. Have to agree with @SubZeroGaming that this is hardly ideal.